<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id='app'>
        <div>姓：<input type="text" v-model="firstName"></div>
        <div>名：<input type="text" v-model="lastName"></div>
        <div>姓名: {{getFullName()}}</div>
    </div>
    <script>
    const vm = new Vue({
        el: '#app',
        data: {
            firstName:'',
            lastName:'',

        },
        methods:{
            getFullName(){
                    return this.firstName + this.lastName 
                }
        }
    })
    </script>
</body>
</html>